netdev - Re: [PATCH net-next v4 1/2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Fri, 21 Apr 2017 12:01:07 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     David Miller <davem@...emloft.net>
Cc:     eric.dumazet@...il.com, jiri@...nulli.us, netdev@...r.kernel.org,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next v4 1/2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On 17-04-21 11:55 AM, Jamal Hadi Salim wrote:
> On 17-04-21 11:38 AM, David Miller wrote:

>> If a user says "enable X" and it just gets simply ignored by older
>> kernels, that can't work properly.  What if "enable X" is something
>> like "turn on encryption"?  Are you OK with the user getting no
>> feedback that their stuff is not going to be encrypted?
>>
>
> For this specific use case:
> Dont they need a newer kernel which supports "enable encryption"?

Also: What happens to this user space app when it encounters an
older kernel?

Using rejection as a capability discovery wont work I think.

cheers,
jamal